Origin of superconductivity transition broadening in MgB2

Masui, T.; Lee, S; Tajima, S.

doi:10.1016/s0921-4534(02)02049-x

Cited by 38 publications

(20 citation statements)

References 33 publications

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“…The other is for fields above 1 T, which is associated with more anisotropic σ-band [2,4]. Large vortex fluctuations [44] and vortex dissipation [45] have been reported in clean systems at high fields, which is in agreement with a clear change on the vortex dynamics. The contribution of each band to the J c value depends on inter-and intra-band coupling, density of states at the Fermi surface, and Fermi velocity for each band.…”

Section: Resultssupporting

confidence: 66%

Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film

Kim

Haberkorn

Nazaretski

et al. 2015

Solid State Communications

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a b s t r a c tWe report the influence of two-band superconductivity on the flux creep and the critical current densities of a MgB 2 thin film. The small magnetic penetration depth of λ¼ 507 10 nm at T ¼ 4 K is related to a clean π-band. We find a high self-field critical current density J c , which is strongly reduced with applied magnetic field, and attribute this to suppression of the superconductivity in the π-band. The temperature dependence of the creep rate S (T) at low magnetic field can be explained by a simple Anderson-Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field.

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Section: Resultssupporting

confidence: 66%

Strong magnetic field dependence of critical current densities and vortex activation energies in an anisotropic clean MgB2 thin film

Kim

Haberkorn

Nazaretski

et al. 2015

Solid State Communications

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“…The first one concerns the superconducting fluctuation. 17 However taking account of the very low T C and relatively large H C ͑see below͒, the superconducting fluctuation is believed to be weak since the ratio between the condensation energy H C 2 / 8 3 and k B T C is rather large. A second concern about the kink feature observed in resistive transition curves under moderate fields would be the inhomogeneity of superconductivity.…”

Section: Structure Illustration and Transport Propertiesmentioning

confidence: 99%

Physical properties of the noncentrosymmetric superconductorRu7B3

et al. 2009

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Physical properties have been comprehensively investigated on the noncentrosymmetric superconductor Ru 7 B 3 with T C = 3.3 K. It is found that the superfluid comprises a major component with a full-gap feature instead of a nodal-like pairing symmetry as revealed by specific-heat and lower-critical-field measurements. Combining with resistivity ͑ xx and xy ͒ and electronic band-structure calculation, the superconducting and normal-state physical parameters were determined by a self-consistent analysis. It is found that Ru 7 B 3 may belong to a single band superconductor with energy gap of 0.5 meV and could be categorized into type-II superconductor with weak electron-phonon coupling. An unusual "kink" feature is clearly observed in the field induced broadening of the resistivity curves. Possible reasons are given for this unusual two-step transition.

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“…This aspect can be easily verified by the transition width at zero external fields. There are some reports that suggest that the broadening can be due to surface and multiband superconductivity [6]. But in general terms, it is understood that the vulnerability to thermal fluctuations in superconductors is well characterized by the Ginzburg number (Gi) = in the range from 0 -7 T and the direction of transport probe current was kept perpendicular to the applied field.…”

Section: Introductionmentioning

confidence: 99%